Here's what I did.
Sandblasted it, welded the seams, ground them, and then applied All Metal filler to smooth the welds out. I then painted it with an Omni low gloss black paint that my local paint distributor mixed for me. I talked to DSE and got the PPG code they use on all their builds, but didn't feel like paying $80+ dollars just for the quart of paint plus the hardener and reducer. I went the budget route and payed $26/quart instead. Turned out excellent IMO. This was my first time working with a filler, so it's not perfect, but most areas you'll never see anyway.
Here's pictures.
